Originally Posted by
jeph
Also, it might be worth find a better grade of bolt that has more shear and tensile strength.
Avoiding some of the ostensibly more controversial portions of the post above, I agree with this sentiment. If you have a "nut/bolt/fastener" shop in your town, they'll be able to fix you up; I'm not sure if Home Depot or the local hardware stores would be well versed in various bolt grades. A proper grade 8 bolt will not break.